Pcastle b-link bluetooth interface adapter/p pesc tuning is an essential component for customizing vehicle performance users enjoy the ability to adjust many variables to enhance their experience including throttle, braking curve, drag brake, reverse type and morebr /br /the castle b-link bluetooth adapter enables users to wirelessly program settings on current castle creations escs, many older models and the bec 20/bec pro on apple ios devices the free castle link app for ios is available on the apple app store for use with iphones and ipads, and once downloaded, it does not require a data connection and can be used anywhere, including remote areasbr /br /data log download is now available on the castle link app on android and ios/p pbfeatures/b/p ul licompact and lightweight/li liconvenient waterproof design/li lifor apple ios/li lifree castle link app download/li /ul pbspecifications/b/p ul lidimensions 120 x 81 x 25 3048mm x 2055mm x 655mm/li liweight 023oz 662g/li /ul